Die casting machine



Oct. 18, 1949. j lN K 2,485,290

DIE CASTING MACHINE Filed Jan. 18, 1947 5 Sheets-Sheet l INVENTOR.

ALF/RFD fi' JEL/NEK 18, 1949- A. F. JELINEK DIE CASTING MACHINE 5Sheets-Sheet 2 Filed Jan. 18, 1947 INVENTOR. ALFPED EJEL/NEK,

Oct. us, 1949. F; J LINEK 2,485,290

DIE CASTING MACHINE Filed Jan. 18, 1947 3 Sheets-Sheet s IN VEN TOR.ALFPEDFJEL /NK Patented Oct. 18, 1949 U NI T E D STATES QFFTI.

DIE CASTING mounts 2 Alfred F. Jelinek, Cleveland; (Elliio, assignor toThe- Cleveland Automatic Machine company -Cleve land, Ohio, acorporation'of Ohiov Application January 18, 1947; Serial No. 722,871

This invention relates generally todie casting machines. of thehorizontally movable die typ and more specifically to improvements inthe support for the die plates therein.

die casting machines of the foregoing type, thefiie parts are supportedupon two heavy rigid vertical plates,'one of which is stationary duringoperation of the machine, the other of which is mbunte'd for retractionrelative thereto in order to "facilitate separation of the dies. It iscustomary in machines of this character to support the, movable plate ona'jplura'lity of guide bars disposed in parallel relation to the bed ofthe machine and mounted adjacent the opposed ends thereof. In prior artdevices difiiculty has been encountered in maintaining alignment of thetwo die members due to the deflection of the guide bars. under thecombined weight of the die and movable plate. In many instances, theguide bars have been bowed to such extent as to inhibit registration ofthe die 'parts or intimate engagement of the mating faces thereof.

The primary object of this invention resides in the provision of astructure which will assure alignment of the die parts at all timesthroughout the life of the machine. To this end, the movable die plateis onstructed so that the major portion of the weight thereof is imposedupon the bed of the machine and the guide bars are relieved from anyfunction other than that of maintaining the movable die member inaligned relation with its companion part.

Another object of the invention is to provide a support for themovabledieparts which will facilitate adjustments thereof to compensatefor wear or the replacement of worn parts-without dismantling themovable plate assembly.

A further object of the invention resides in the provision of a loadsupporting structure that may be readily interposed between the bed andmovable die plate in machines of a like character.

Other objects and advantages more or less ancillary to the foregoingand-the manner in which all the various objects are realized will appearin the following description, which considered in connection with theaccompanying drawing's, sets forth the preferred embodiment of theinvention.

In the drawings:

Fig. 1 is a side elevation of the improved die casting machineillustrating the major elements thereof;

Fig. 2 is a section taken on the line 2-2 of Fig. 1 showing a generalarrangement of the toggle mechanism;

2 Claims. (01. 22-92 Fig. 3 isa sectiontaken on the line 4-4- ofFig. 1showing the improved rod supporting structure embodying the presentinvention;

Fig. 4 i'sa fragmentary section through oneoi the improved rodsupporting assemblies; and

Fig. 5 is a perspective view of one of the ad'- ju'sti-ng'wedge blocks.

One die casting machine within which-theimproved supporting structuremay be incorporated is-described in U. S. Patent No, 2,334,372, issuedto Abbottetal. on November 1 6', 1943. The-prese'nt invention isillustrated and described as a plied to the machine of the aforesaidpatentthough certain structural details thereof, which are not directlypertinent to the improved support, have -be'enom'itted herein.

The bed ll! of the ma'chin'e is preferably cons'tructed from fabricatedsheet steel members H having ways [-2- mounted thereon. The forward endof the machine is provided with a stationary die supporting plate l3which cooperates with the movable die supporting plate hi to support.the die parts D. The opposed end of the ma-- chine is formed with asecond stationary plate I 5, both of "the stationary plates being boredad'- jacent the corners thereof for the support of guide bars 16. Thedie plate M is 'apertured for sliding engagement upon the bars and ispreferably provided with elongated bosses ll circum ambient the bores toincrease'thewearing surface and assure the stability of the plate. Atoggle mechanism 2|] is provided to elfect the reciprocation of the dieplate l4 and holdthe die parts in impinged relation with each otherduringthe casting operation. The toggle mechanism is actua-ted by pushrod 2i connected to a pistonan'd cylinder assembly of conventionalior-m. Admission of fluid alternately to one or the other end of thecylinder advances or retracts the movable die plate at the proper timeduring the operating: cycle of the machine. To this end, a pumpingdriven by a prime mover, (not shown) supplies fluid under pressurethrough a control valve 23! and conduits 24 to the cylinder as required.The ways lZ-areformed with T-slots 21 (Figs. 3 and 4 for the receptionof T-headed bolts 28 mounted in the base of the plates I3 and 15.

As described in the Abbott patent referred toabove, it is customary toprovide a cylinder 29 having a piston therein for actuating a plunger inthe molten metal supply system to inject molten metal under pressureinto the die cavities. Cylinder 29 may be adjustably mounted on a pairof rods 25 as described in the aforesaid Abbott patent, the details ofthe mounting forming no part of the invention. A blower, furnace andmelting pot, housed within a chamber 30, are provided to reduce themetal to a molten state. The latter parts are not shown in detail hereinsince they form per se no part of the present in vention. The cylinder29 is connected by suitable conduits 32 to control valves 33 indicatedschematically in Fig. 1. A tank 34 containing liquid under the pressure,such as nitrogen, is customarily employed for actuating the piston inthe cylinder 29. When the control valves 33 are operated at the propertime during the operative cycle of the machine, the piston in thecylinder 29 effects the rapid injection of a metered amount of moltenmetal into the die cavities.

In order to relieve the guide bars iii of part or all of the load exceptthat exerted in the exercise of their guiding function, the upper facesof the central portions of the ways l2 have secured thereto by means ofscrews 39 a pair of hardened wear plates 40 which are disposed in acommon horizontal plane and surface ground parallel to the axis of theguide bars 16. As illustrated in Figs. 3 and 4, the base of the movabledie plate I4 is formed with inclined corners M which are engaged withbronze saddles or supporting blocks 42, having flat bottom surfaces forsliding engagement with the wear plates 40 and upper inclined surfaces43 congruent to the associated surfaces 4| in the die plate. Thevertically disposed ears or side walls 41 (Fig. of the blocks are formedfor abutting engagement with the opposed faces of the plate in order toeffect the retention of the blocks against longitudinal displacementduring the reciprocative movement of the plate.

The forward face of each block 42 is tapped for the reception of capscrews 44 for the support of a plate 45 having a clearance hole in thecentral portion thereof to receive a draw bolt 46 threaded in side wallof the die plate 14. With this structure, the draw bolts 46 may beadjusted until die plate is suitably elevated to relieve the load uponthe guide bars and permit the plate to move freely thereover. Obviously,if the blocks are adjusted too far inwardly, the die plate 14 will bearagainst the bottom of the guide bars and undesirable wear and bindingwill occur. Likewise, if the blocks are withdrawn too far, the weight ofthe die plate will be imposed upon the guide bars and will cause them tosag or bow characteristic of the prior art devices. In the initialconstruction of the machine, dial indicators may be employed to measureheight and parallel relation between the guide bars and the hardenedplates 49. A like procedure may be followed thereafter in adjusting theHaving described in detail one embodiment of the present invention, itwill readily be recognized that a simple, yet highly effectivestructure, has been provided to convert the action of the somewhaterratic machines of the prior art into a machine which is dependable,accurate and capable of maintaining alignment of the die members,irrespective of wear.

Although the foregoing description is necessarily of a detailedcharacter, in order that the invention may be completely set forth, itis to be understood that the specific terminology is not blocks, thedial indicators or other measuring instruments being used in this case,however, to check the deflection of the bars 15. With this construction,the guide bars serve to perform the function of dowels rather than loadcarrying members; hence, the die members will be maintained in alignedrelation with each other and the parting line marking on the diecastings will be minimized. The wear plates 40 may be removed, replacedor resurfaced if objectionable wear is encountered. Being of simple,easilymachined construction such replacement or resurfacing may be doneeconomically.

intended to be restrictive or confining, and that various rearrangementsof parts and modificationsOf detail may be resorted to without departingfrom the scope or spirit of the invention as herein claimed.

What I claim is:

1. In a die casting machine, a bed, a stationary die plate supported bysaid bed, a bracket supported by said bed, guide rods supported by saiddie plate and bracket, a movable die plate slidably mounted on saidguide rods, wear plates hay ing a flat upper surface, means removablymounting said wear plates on said bed for slidably supporting saidmovable die plate, and shoe means mounted on said movable die plate forengaging said wear plates to relieve said guide rods of the weight ofthe movable die plate, said shoe means being adjustable to increase theeffective vertical dimension thereof so that the apportionment of theload supporting function between the guide rods and the wear plates maybe controlled.

2. In a die casting machine, a bed, a stationary die plate supported bysaid bed, a bracket supported by said bed, guide rods supported by saiddie plate and bracket, a movablev die plate slidably mounted on saidguide rods, a pair of wear plates having fiat upper surfaces formed onsaid bed for slidably supporting said movable die plate, means removablyattaching said wear plates to the bed, there being a beveled bearingsurface formed on opposite sides of said movable die plate, and beveledshoe means on said movable die plate for engaging said wear plates torelieve said guide rods of the weight of the movable die plate, saidshoe means being adjustable to increase the effective vertical dimensionthereof so that the apportiomnent of the load supporting functionbetween the guide rods and the wear plates may be controlled.

ALFRED F. J ELINEK.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS

